Book Image

Real-World SRE

By : Nat Welch
Book Image

Real-World SRE

By: Nat Welch

Overview of this book

Real-World SRE is the go-to survival guide for the software developer in the middle of catastrophic website failure. Site Reliability Engineering (SRE) has emerged on the frontline as businesses strive to maximize uptime. This book is a step-by-step framework to follow when your website is down and the countdown is on to fix it. Nat Welch has battle-hardened experience in reliability engineering at some of the biggest outage-sensitive companies on the internet. Arm yourself with his tried-and-tested methods for monitoring modern web services, setting up alerts, and evaluating your incident response. Real-World SRE goes beyond just reacting to disaster—uncover the tools and strategies needed to safely test and release software, plan for long-term growth, and foresee future bottlenecks. Real-World SRE gives you the capability to set up your own robust plan of action to see you through a company-wide website crisis. The final chapter of Real-World SRE is dedicated to acing SRE interviews, either in getting a first job or a valued promotion.
Table of Contents (13 chapters)


To test something is to verify that it works as expected. You can test just about everything and in a sense, testing is very similar to the analysis mentioned in Chapter 4, Postmortems. However, instead of coming up with a hypothesis, you are taking something that you want to exist, creating it, and then verifying that the thing you created does what you want. Be aware of the famous Dijkstra quote: "Testing shows the presence, not the absence of bugs." This is another way of saying that whatever hypothesis you test, you will not necessarily invalidate other hypotheses.

Some people ask why you should bother with testing. There is a belief that often exists, when people haven't done much programming with larger groups, that testing is pointless. This belief often comes from being told that testing is important but not seeing any immediate benefits. Testing can be frustrating and daunting, but it is not pointless because, as we have mentioned, humans are flawed. We misremember...